INVESTIGADORES
CAMPOS Claudia Monica
artículos
Título:
Changes in Monte Desert Plant Communities Induced by a Subterranean Mammal
Autor/es:
CLAUDIA MONICA CAMPOS; GIANNONI, STELLA MARIS; BORGHI, CARLOS EDUARDO
Revista:
Journal of Arid Environments
Referencias:
Lugar: London; Año: 2001 vol. 47 p. 339 - 345
Resumen:
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Herbivory
by medium-sized rodents is of great importance in Monte desert
communities. In this paper we study changes in the plant cover, plant
composition and diversity in two creosotebush communities of the
Monte desert induced by the herbivorous subterranean rodent Ctenomys
sp. (tuco-tuco). We
studied two sites: a community where only Larrea divaricata is
dominant (Site 1), and a mixed community dominated by L.
cuneifolia and L. divaricata (Site 2). On both
sites we studied two types of areas: highly disturbed by Ctenomys,
and less disturbed by this species. In the highly disturbed areas,
herb cover decreased in both
plant communities (6.4% vs.
14.1%, and 15.1% vs. 32.4% respectively), whereas shrub cover
diminished significantly only in Site 1. The foraging activity of
this herbivore affected the cover of Pappophorum caespitosum,
Aristida sp., and Digitaria sp. Herb diversity was
significantly different between highly and less disturbed areas in
both communities considered, although it was higher in the less
disturbed area on Site 1, and in the highly disturbed area on Site 2.
Shrub diversity did not vary signicantly between highly and less
disturbed areas.